Experimental study of thermal performance and flow behaviour with winglet vortex generators in a circular tube

Xu, Yujie; Islam, M.D.; Kharoua, Nabil

doi:10.1016/j.applthermaleng.2018.01.112

Cited by 57 publications

(13 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The convection heat transfer coefficient increases with increasing airflow velocity. The higher flow velocity causes higher turbulent intensity resulting in better mixing of the flow and enhancing heat transfer [13,26]. From Figures 8 and 9, it can also be concluded that the impact of the hole on VGs on the heat transfer rate is very small.…”

Section: Intensity Of Longitudinal Vortexmentioning

confidence: 89%

“…Their simulation results showed that RWP VGs increase heat transfer higher than DWP VGs in both CFU and CFD installation orientations. Xu et al [13] experimentally investigated the thermal performance and flow behavior with a winglet vortex generator inserted in a circular pipe. The results of their study indicated that the best increase in heat transfer occurs at an angle of attack of 30° and a ratio of B = 0.1.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Analysis of Heat and Fluid Flow Characteristics of Airflow Inside Rectangular Channel with Presence of Perforated Concave Delta Winglet Vortex Generators

Syaiful¹,

Siwi²,

Utomo³

et al. 2019

IJHT

View full text Add to dashboard Cite

This study is intended to analyze numerically and experimentally the characteristics of heat transfer augmentation and pressure drop of airflow through vortex generators mounted to a heated plate inside a rectangular channel. Delta winglet pairs (DWPs) and concave delta winglet pairs (CDWPs) vortex generators (VGs) with one, two, and three rows were used in this study. Heat transfer enhancement and pressure drop of flow passing through the VGs with a 5 mm diameter hole for one, two, and three holes in certain positions were investigated. VGs were mounted in-line with an attack angle of 15° to the flow. The airflow was assumed to be incompressible; the steady-state and air velocity were varied in the range of 0.4 m/s to 2 m/s. The analysis showed that the use of holes in the delta winglet vortex generators could reduce the pressure drop of 34.14% from the delta winglet without holes at a velocity of 2 m/s. By using perforated delta (DWP VGs) and concave delta winglet (CDWP VGs), the heat transfer coefficient is reduced by 1.81% and 7.03% of the delta and concave delta winglet vortex generators without holes at a velocity of 2 m/s.

show abstract

Section: Intensity Of Longitudinal Vortexmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Heat and Fluid Flow Characteristics of Airflow Inside Rectangular Channel with Presence of Perforated Concave Delta Winglet Vortex Generators

Syaiful¹,

Siwi²,

Utomo³

et al. 2019

IJHT

View full text Add to dashboard Cite

show abstract

“…Koefisien perpindahan panas konveksi meningkat dengan meningkatnya kecepatan aliran untuk kasus RWP VGs seperti yang ditunjukkan pada Gambar 5. Hal ini terjadi karena intensitas turbulen dan interaksi fluida meningkat dengan meningkatnya kecepatan aliran [25].…”

Section: Hasil Dan Pembahasan 31 Efek Vortex Generator Terhadap Perpindahan Panasunclassified

Performa Termal dan Hidrolik Aliran Udara Melalui Vortex Generator Berlubang Tipe Concave Rectangular Winglet di dalam Saluran Persegiempat: Studi Eksperimen

Syaiful

Syarif

Yunianto

et al. 2020

JRM

View full text Add to dashboard Cite

Fin and tube heat exchangers use gas as a cooling/heating medium on the fin side. The low thermal conductivity of gases results in high thermal resistance, which results in a low rate of heat transfer. Therefore, the researchers sought to reduce thermal resistance on the fin side. This study aims to increase heat transfer by reducing thermal resistance using a longitudinal vortex generator. However, the use of vortex generators will increase the pressure drop. Perforated vortex generators were investigated in this study to overcome this problem. Concave rectangular winglet vortex generator at an angle of attack of 30° with variations of without hole, one, two, and three holes were studied. In this experiment, the number of pairs of vortex generators was varied from one to three pairs. A plate on which the vortex generator is mounted is heated at a heat rate of 35 W. Air enters the channel through the straightener at variations in the velocity of 0.4 m/s to 2 m/s at intervals of 0.2 m/s. The results showed that the value of the convection heat transfer coefficient for the use of perforated concave rectangular winglet vortex generators was 85.4% higher than the baseline. This value is 13.7% higher than the use of perforated rectangular winglet vortex generators. Whereas the value of pressure drop for the use of perforated concave rectangular winglet vortex generators is five times higher than that of the baseline. This value is 104.9% higher than the use of perforated rectangular winglet vortex generators.

show abstract

“…Increased heat transfer in heat exchangers is more effective through a passive method using vortex generators (VGs). VGs generate longitudinal vortices, which enhance fluid mixing so that the heat transfer rate increases [1]. The longitudinal strength of the vortex (LV) is influenced by the aspect ratio of VG [2].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement inside Rectangular Channel by Means of Vortex Generated by Perforated Concave Rectangular Winglets

Syaiful

Hendraswari

S.U.

et al. 2021

Fluids

View full text Add to dashboard Cite

Passive methods using vortex generators (VGs) to enhance heat transfer have been a concern of researchers in recent decades. This study is intended to investigate the strength of the vortex generated by VGs by trying to reduce the pressure drop in the flow. The present work also takes into account the influence of the vortex intensity on the improvement of heat transfer, which can be indicated by the low value of the synergy angle. Experiments were carried out in the current investigation to validate the results of the numerical simulations in the Reynolds number range of 3102 to 16,132. The study results indicate that the observed heat transfer coefficients from the experimental and simulation results have a similar tendency with relatively small errors. A reduction in pressure drop is observed with the use of perforated concave rectangular winglets (PCRWs) against the nonperforated ones although there was a slight decrease in heat transfer improvements.

show abstract

Experimental study of thermal performance and flow behaviour with winglet vortex generators in a circular tube

Cited by 57 publications

References 31 publications

Numerical Analysis of Heat and Fluid Flow Characteristics of Airflow Inside Rectangular Channel with Presence of Perforated Concave Delta Winglet Vortex Generators

Numerical Analysis of Heat and Fluid Flow Characteristics of Airflow Inside Rectangular Channel with Presence of Perforated Concave Delta Winglet Vortex Generators

Performa Termal dan Hidrolik Aliran Udara Melalui Vortex Generator Berlubang Tipe Concave Rectangular Winglet di dalam Saluran Persegiempat: Studi Eksperimen

Heat Transfer Enhancement inside Rectangular Channel by Means of Vortex Generated by Perforated Concave Rectangular Winglets

Contact Info

Product

Resources

About